The Storage is an optional accessory which can be placed behind the chair, between the two back laminates. The Storage can be used to store anything small behind the chair, such as toys, utensils, or anything else that might be relevant.
The Storage can be used on the chair even when if Baby Set is attached, as there is enough space between the two back laminates to make space for the Storage, as well as the two plastic parts of the Baby Set.